"mirror" coated plastic

Does anyone know of a source of a "mirror" coated plastic that can be used in an exterior application? We are looking for something like a Rowmark material that has one surface that would appear to be polished stainless steel. I have lookeed on the Rowmark website and see a lot of "brushed" surface material but none with a "polished" surface look.
Regards
Peter

Laird plastics carries it.
WWW.lairdplastics.com

I'm pretty sure you can get Dibond in a mirrored or brushed finish as well. I get mine from HarborSales.net

-B